It has become trendy within the sweet dude community to adopt a "punkish" style which can include anything from a Clash t-shirt to a short Mohawk, possibly dyed blue.
Other activities you might see a sweet dude engaged in:
Drinking Bud, Coors, or Miller lt.
Listening to Dave Matthews and Jack Johnson
Tossing a football
Wearing gold chains
Getting tribal tattoos
Yelling, "Show us your tits!"